S-90117A544 1/4"-20 x 1 1/4" ASME B18.3 Alloy Steel Wire-Lockable Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
• Superior thread precision with Class 3A fit provides tighter tolerances for secure, vibration-resistant assemblies in demanding applications.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance, extending service life in harsh industrial environments.
• Coarse UNC threading allows for quicker installation and better grip in softer materials or where frequent disassembly is required.
• Hex socket drive design enables high torque application and access in confined spaces, improving assembly efficiency.
• Full threading along the 1-1/4" length ensures maximum engagement and holding power across the entire fastener.
• Compliance with ASME B18.3 and environmental regulations guarantees consistent quality and safe use in regulated industries.

Professional Applications & Engineering Value

This 1/4"-20 UNC Socket Head Cap Screw is engineered to address critical challenges in industrial assembly, where high tensile strength and vibration resistance are paramount. The black-oxide alloy steel construction provides durability against wear and mild corrosion, making it ideal for machinery, automotive, and heavy equipment applications. Its coarse thread design ensures reliable performance in materials prone to stripping, while the Class 3A thread fit minimizes backlash in precision assemblies. The hex socket drive allows for secure torque transmission in tight spaces, reducing installation time and improving maintenance workflows. By meeting ASME B18.3 standards, this screw delivers consistent dimensional accuracy, ensuring compatibility and reliability in high-stress engineering environments.

Specification Summary & Compliance

This socket head cap screw features a 1/4"-20 UNC coarse thread with Class 3A fit for precise engagement and high tensile load capacity. It is manufactured from alloy steel with a black-oxide surface treatment for corrosion resistance. The screw complies with ASME B18.3 for dimensional standards, RoHS 3 (2015/863/EU) for hazardous substance restrictions, and REACH (EC 1907/2006) for chemical safety, ensuring it meets rigorous industrial and environmental requirements.